Mine Isn't

Texas talk is losing its twang - latimes.com: Back in the 1980s, about 80% of Texans interviewed by researchers at UT Austin, including many students, had traditional Texas accents. Now that's down to a third.

Don Graham, who's quoted a bit in the article, and I went to grad school together.  I can vouch for his accent

Hat tip to Walter Satterthwait.